Wave Washer M70x79 65Mn Spring Steel — stocked and shipped worldwide by SFX Fasteners. Available for single-piece retail orders — no minimum order — dispatched from our own warehouse within 24–48 hours.
Specifications
| Material | 65Mn Spring Steel |
| Grade | Grade 4.8 |
| Diameter | M70 |
| Length | 79 mm |
| Surface Finish | Black Oxide |
| Brand | SFX Fasteners |
Ordering & shipping
| Minimum order | No minimum — single pieces welcome |
| Pricing | Order totals are confirmed at checkout, before payment |
| Custom & dropship | Small batches to drawing · blind dropshipping on request |
| Dispatch | 24–48 hours for stock items |
| Shipping | Worldwide, calculated at checkout by weight and destination |
Need a specific size, grade or standard? Send us a quote request — we quote to drawing and to DIN / ANSI / GB / JIS standards.
About this washer
This is a washer in 65Mn Spring Steel, at strength class Grade 4.8, supplied black oxide, with an M70 thread and a 79 mm length. Every dimension is stated against the standard named above; where a tolerance class matters to your design, ask us and we will confirm it in writing before you order.
A washer spreads the clamp load of the fastener over a wider area of the joint face and keeps the turning nut or head from scoring the part underneath. Fitted under bolts, screws and nuts on soft or painted surfaces, slotted holes, and any joint that is taken apart often enough for the face to matter.
Black oxide is a conversion coating about 1–2 µm thick, usually oiled. It adds mild corrosion resistance and keeps dimensions exact, which matters on 10.9 and 12.9 parts — there is no hydrogen embrittlement risk.
Grade 4.8 is low-carbon steel at 400 MPa tensile / 320 MPa yield. Suitable for light-duty, non-critical joints and the cheapest option per piece.
Sold by the piece, so one is a valid order. Stock lines leave our warehouse within 24–48 hours of cleared payment, and freight is calculated at checkout from the packed weight and the destination.
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